I want to package on conda a software based on ROOT (6.30.04)

I need to use/edit a .rootrc that comes with my software but I do not know where to put it, because I cannot edit the system one as it is installed from the root conda package and it will notice that it has been modified, and I do not want to look for it in the home (that is the point of an isolated environment).

Is it possible to tell ROOT to load this "user" .rootrc file from a different dir like $CONDA_PREFIX/etc? e.g. by setting some environment variable?